Unless you riding desert, sandy trails you don't need spare air filter, I reused paper filters many times with no problems, knocked the dust off and washed them in soapy water, then let it dry on sun.
Recently I bought pipercross foam filter to my tenere as I ride in sand a lot, more confinement to wash. U use kitchen detergents not fuel.
A I read many studies paper filter are the most efficient anyway, while K&N the least.
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